11/2÷0.4=1.35÷x；12+3（x-1）=18；5x+1=3+3（1-x）；x÷48=24÷32；x÷2.6=2.88÷15.6

11/2÷0.4=1.35÷x；11/2x=1.35×0.45.5x=0.54x=27/27512+3（x-1）=18；12+3x-3=183x=9x=35x+1=3+3（1-x）；5x+1=3+3-3x8x=5x=5/8x÷48=24÷32；32x=24×482x=24×3x=36x÷2.6=2.88÷15.615.6x=2.88×2.612x=2…